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Title: US5465317: Speech recognition system with improved rejection of words and sounds not in the system vocabulary
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Country: US United States of America

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13 pages

 
Inventor: Epstein, Edward A.; Putnam Valley, NY

Assignee: International Business Machines Corporation, Armonk, NY
other patents from INTERNATIONAL BUSINESS MACHINES CORPORATION (280070) (approx. 44,393)
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Published / Filed: 1995-11-07 / 1993-05-18

Application Number: US1993000062972

IPC Code: Advanced: G10L 11/02; G10L 15/06; G10L 15/14; G10L 15/28;
IPC-7: G10L 5/06;

ECLA Code: G10L25/78;

U.S. Class: Current: 704/236; 704/251; 704/256; 704/256.4; 704/E11.003;
Original: 395/002.45; 395/002.6; 395/002.65;

Field of Search: 395/2.42,2.45,2.47,2.6,2.65

Priority Number:
1993-05-18  US1993000062972

Abstract:     A speech recognizer that selects a command model for a current sound if the best match score for the current sound exceeds its corresponding threshold score. The threshold score is assigned a confidence score based on the best match score and recognition threshold of a prior sound. When the best match score for the current sound exceeds a "poor" confidence score but is less than a "good" confidence score: (a) the word corresponding to the acoustic model having the best match score is accepted as highly likely to correspond to the measured sound if the previously recognized word was accepted as having a high likelihood of corresponding to the previous sound; (b) the word corresponding to the acoustic model having the best match score is rejected as highly unlikely to correspond to the measured sound if the previously recognized word was rejected as having a low likelihood of corresponding to the previous sound; or (c) if there is sufficient intervening silence between a previously rejected word and the current word, then the current word is also accepted as having a high likelihood of corresponding to the measured current sound.

Attorney, Agent or Firm: Schechter, Marc D. ; Tassinari, Jr., Robert P. ;

Primary / Asst. Examiners: MacDonald, Allen R.; Onka, Thomas J.

Maintenance Status: E3 Expired  Check current status

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Designated Country: DE FR GB 

Family: Show 7 known family members

First Claim:
Show all 20 claims
I claim:     1. A speech recognition apparatus comprising:
  • an acoustic processor for measuring the value of at least one feature of each of a sequence of at least two sounds, said acoustic processor measuring the value of the feature of each sound during each of a series of successive time intervals to produce a series of feature signals representing the feature values of the sound; means for storing a set of acoustic command models, each acoustic command model representing one or more series of acoustic feature values representing an utterance of a command associated with the acoustic command model.
  • a match score processor for generating a match score for each sound and each of one or more acoustic command models from the set of acoustic command models, each match score comprising an estimate of the closeness of a match between the acoustic command model and a series of feature signals corresponding to the sound; and
  • means for outputting a recognition signal corresponding to the acoustic command model having a best match score for a current sound if the best match score for the current sound is greater than a recognition threshold score for the current sound, the recognition threshold score for the current sound is equal to (a) a first confidence score if the best match score for a prior sound was greater than a recognition threshold for the prior sound, or (b) a second confidence score greater than the first confidence score if the best match score for the prior sound was less than the recognition threshold for the prior sound.


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Forward References: Show 48 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (48)   |   Backward references (10)   |   Citation Link

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Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 9pp US4052568  1977-10 Jankowsi  Communications Satellite Corporation Digital voice switch
Get PDF - 35pp US4759068  1988-01 Bahl et al.  International Business Machines Corporation Constructing Markov models of words from multiple utterances
Get PDF - 20pp US4955056  1990-09 Stentiford  British Telecommunications public company limited Pattern recognition system
Get PDF - 50pp US4977599  1990-12 Bahl et al.  International Business Machines Corporation Speech recognition employing a set of Markov models that includes Markov models representing transitions to and from silence
Get PDF - 45pp US4980918  1990-12 Bahl et al.  International Business Machines Corporation Speech recognition system with efficient storage and rapid assembly of phonological graphs
Get PDF - 27pp US5182773  1993-01 Bahl et al.  International Business Machines Corporation Speaker-independent label coding apparatus
Get PDF - 15pp US5195167  1993-03 Bahl et al.  International Business Machines Corporation Apparatus and method of grouping utterances of a phoneme into context-dependent categories based on sound-similarity for automatic speech recognition
Get PDF - 6pp US5197113  1993-03 Mumolo  Alcatel N.V. Method of and arrangement for distinguishing between voiced and unvoiced speech elements
Get PDF - 13pp US5280562  1994-01 Bahl et al.  International Business Machines Corporation Speech coding apparatus with single-dimension acoustic prototypes for a speech recognizer
Get PDF - 16pp US5369728  1994-11 Kosaka  Canon Kabushiki Kaisha Method and apparatus for detecting words in input speech data
       
Foreign References:
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Publication Date IPC Code Assignee   Title
Get PDF - 11pp EP0241163A1 1987-03  G10L 5/06 AMERICAN TELEPHONE & TELEGRAPH Speaker-trained speech recognizer 
Get PDF - 35pp EP0314908A2 1988-09  G10L 5/06 IBM Automatic determination of labels and markov word models in a speech recognition system 
Get PDF - 16pp EP0523347A2 1992-05  G10L 5/06 IBM A fast algorithm for deriving acoustic prototypes for automatic speech recognition 


Other Abstract Info: DERABS G94-359897

Other References:
  • Bahl, L. R.., et al. "Vector Quantization Procedure For Speech Recognition Systems Using Discrete Parameter Phoneme-Based Markov Word Models." , IBM Technical Disclosure Bulletin, vol. 32, No. 7, Dec. 1989, pp. 320 and 321.
  • Jelinek, F. "Continuous Speech Recognition by Statisical Methods." Proceedings of the IEEE, vol. 64, No. 4, Apr. 1976, pp. 532-556. (25 pages) Cited by 30 patents


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